Swanachild (also Swanahild or Serenahilt) was the second wife of Charles Martel, who brought her back from his first campaign in Bavaria in 725, along with her uncle Grimoald's wife, Biltrude. Swanachild belonged to the clan of the Agilolfings though her parentage is not quite clear. Her parents could be:Tassilo II, duke of Bavaria, and his wife ImmaTheodbert, duke of Bavaria and his wife RegintrudWith Charles Martel she had one child, Grifo.